2 the working principle of rotary vane vacuum pump 2 x)

double rotary vane vacuum pumps ( Rotary vane pump) Working pressure range? 。 ×- （ Pa） Low vacuum pump. It can be used alone, or as a high vacuum pump or other ultrahigh vacuum pump of the former. It has been widely used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, petroleum, pharmaceutical production and scientific research departments. Rotary vane pump can be extracted in the container of dry gas seal gas ballast, if the equipment can also be used for a certain amount of non-condensable gas. But it is not for the extraction of high oxygen, a corrosive action on metals, and pump up the chemical reaction will contain particles of dust and gas oil. Rotary vane pump is one of the most basic vacuum to obtain equipment vacuum technology. The small and medium-sized pump rotary vane pump. Rotary vane pump is single stage and double stage two. The so-called two stages, namely, there will be two series single-stage pump structure. More two stage, in order to obtain higher vacuum. Rotary vane pump pumping speed and inlet pressure relationship is as follows: in the inlet pressure for Pa,. Pa and. ×- （ Pa） , the pumping speed values are lower than the nominal pumping speed pump of no less than % % and %. The working principle of rotary vane vacuum pump: the pump, rotor, rotary vane rotary vane pump, cover, spring, etc. Rotary vane pump cavity in the installation of a rotor eccentricity, surface tangent to the cylindrical rotor pump cavity ( The gap is very small) With two spiral spring rotor slot. Rotation, by centrifugal force and the spring tension on the inner wall of the rotary vane pump cavity at the top and stay in touch, along the slide pump rotor driven rotary vane cavity wall. Two rotor blades of the rotor and the pump chamber and two crescent-shaped space surrounded by the end of cap is divided into A, B, C three parts, as the rotor rotation direction of the arrow and absorb, is A space volume is gradually increasing, and in the process of breathing. With vent is gradually reduce the C volume of space, and in the exhaust process. Space center B is gradually reduced, in the process of compression. The responsibility of the demand is gradually increasing because of the space ( The expansion) Quantity, reducing the gas pressure in the external gas pump inlet pressure is greater than in A space, so it's bigger than inhaled gas pressure. When A space cut off from inspiratory mouth, that is, to the space position B, gas begins to be compressed, the volume gradually narrow, finally and vent are interlinked. When compressed air over the exhaust pressure, exhaust pneumatic valve open reservoir through fuel discharge into the atmosphere of compressed gas tank, gas. By the continuous operation of the pump, to achieve continuous extraction. If the exhaust gases through the airway and transfer (to another Low vacuum level) , from low grade vacuum pump, then through low vacuum level back into the atmosphere, which is composed of two stage pump compression. So generally borne by two stage compression ratio, thereby increasing the ultimate vacuum.
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